Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
7796931f JD |
6 | #include <linux/ptrace.h> |
7 | #include <asm/unistd.h> | |
8 | #include <asm/uaccess.h> | |
9 | #include <asm/ucontext.h> | |
1da177e4 | 10 | #include "frame_kern.h" |
1da177e4 LT |
11 | #include "skas.h" |
12 | ||
77bf4400 | 13 | void copy_sc(struct uml_pt_regs *regs, void *from) |
377fad3a JD |
14 | { |
15 | struct sigcontext *sc = from; | |
16 | ||
18baddda JD |
17 | REGS_GS(regs->gp) = sc->gs; |
18 | REGS_FS(regs->gp) = sc->fs; | |
19 | REGS_ES(regs->gp) = sc->es; | |
20 | REGS_DS(regs->gp) = sc->ds; | |
7796931f JD |
21 | REGS_EDI(regs->gp) = sc->di; |
22 | REGS_ESI(regs->gp) = sc->si; | |
23 | REGS_EBP(regs->gp) = sc->bp; | |
24 | REGS_SP(regs->gp) = sc->sp; | |
25 | REGS_EBX(regs->gp) = sc->bx; | |
26 | REGS_EDX(regs->gp) = sc->dx; | |
27 | REGS_ECX(regs->gp) = sc->cx; | |
28 | REGS_EAX(regs->gp) = sc->ax; | |
29 | REGS_IP(regs->gp) = sc->ip; | |
18baddda | 30 | REGS_CS(regs->gp) = sc->cs; |
7796931f | 31 | REGS_EFLAGS(regs->gp) = sc->flags; |
18baddda | 32 | REGS_SS(regs->gp) = sc->ss; |
377fad3a JD |
33 | } |
34 | ||
a5f6096c JD |
35 | /* |
36 | * FPU tag word conversions. | |
37 | */ | |
38 | ||
39 | static inline unsigned short twd_i387_to_fxsr(unsigned short twd) | |
40 | { | |
41 | unsigned int tmp; /* to avoid 16 bit prefixes in the code */ | |
42 | ||
43 | /* Transform each pair of bits into 01 (valid) or 00 (empty) */ | |
44 | tmp = ~twd; | |
45 | tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */ | |
46 | /* and move the valid bits to the lower byte. */ | |
47 | tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */ | |
48 | tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */ | |
49 | tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */ | |
50 | return tmp; | |
51 | } | |
52 | ||
53 | static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave) | |
54 | { | |
55 | struct _fpxreg *st = NULL; | |
56 | unsigned long twd = (unsigned long) fxsave->twd; | |
57 | unsigned long tag; | |
58 | unsigned long ret = 0xffff0000; | |
59 | int i; | |
60 | ||
61 | #define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16); | |
62 | ||
63 | for (i = 0; i < 8; i++) { | |
64 | if (twd & 0x1) { | |
65 | st = (struct _fpxreg *) FPREG_ADDR(fxsave, i); | |
66 | ||
67 | switch (st->exponent & 0x7fff) { | |
68 | case 0x7fff: | |
69 | tag = 2; /* Special */ | |
70 | break; | |
71 | case 0x0000: | |
72 | if ( !st->significand[0] && | |
73 | !st->significand[1] && | |
74 | !st->significand[2] && | |
75 | !st->significand[3] ) { | |
76 | tag = 1; /* Zero */ | |
77 | } else { | |
78 | tag = 2; /* Special */ | |
79 | } | |
80 | break; | |
81 | default: | |
82 | if (st->significand[3] & 0x8000) { | |
83 | tag = 0; /* Valid */ | |
84 | } else { | |
85 | tag = 2; /* Special */ | |
86 | } | |
87 | break; | |
88 | } | |
89 | } else { | |
90 | tag = 3; /* Empty */ | |
91 | } | |
92 | ret |= (tag << (2 * i)); | |
93 | twd = twd >> 1; | |
94 | } | |
95 | return ret; | |
96 | } | |
97 | ||
98 | static int convert_fxsr_to_user(struct _fpstate __user *buf, | |
99 | struct user_fxsr_struct *fxsave) | |
100 | { | |
101 | unsigned long env[7]; | |
102 | struct _fpreg __user *to; | |
103 | struct _fpxreg *from; | |
104 | int i; | |
105 | ||
106 | env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul; | |
107 | env[1] = (unsigned long)fxsave->swd | 0xffff0000ul; | |
108 | env[2] = twd_fxsr_to_i387(fxsave); | |
109 | env[3] = fxsave->fip; | |
110 | env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16); | |
111 | env[5] = fxsave->foo; | |
112 | env[6] = fxsave->fos; | |
113 | ||
114 | if (__copy_to_user(buf, env, 7 * sizeof(unsigned long))) | |
115 | return 1; | |
116 | ||
117 | to = &buf->_st[0]; | |
118 | from = (struct _fpxreg *) &fxsave->st_space[0]; | |
119 | for (i = 0; i < 8; i++, to++, from++) { | |
120 | unsigned long __user *t = (unsigned long __user *)to; | |
121 | unsigned long *f = (unsigned long *)from; | |
122 | ||
123 | if (__put_user(*f, t) || | |
124 | __put_user(*(f + 1), t + 1) || | |
125 | __put_user(from->exponent, &to->exponent)) | |
126 | return 1; | |
127 | } | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave, | |
132 | struct _fpstate __user *buf) | |
133 | { | |
134 | unsigned long env[7]; | |
135 | struct _fpxreg *to; | |
136 | struct _fpreg __user *from; | |
137 | int i; | |
138 | ||
139 | if (copy_from_user( env, buf, 7 * sizeof(long))) | |
140 | return 1; | |
141 | ||
142 | fxsave->cwd = (unsigned short)(env[0] & 0xffff); | |
143 | fxsave->swd = (unsigned short)(env[1] & 0xffff); | |
144 | fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff)); | |
145 | fxsave->fip = env[3]; | |
146 | fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16); | |
147 | fxsave->fcs = (env[4] & 0xffff); | |
148 | fxsave->foo = env[5]; | |
149 | fxsave->fos = env[6]; | |
150 | ||
151 | to = (struct _fpxreg *) &fxsave->st_space[0]; | |
152 | from = &buf->_st[0]; | |
153 | for (i = 0; i < 8; i++, to++, from++) { | |
154 | unsigned long *t = (unsigned long *)to; | |
155 | unsigned long __user *f = (unsigned long __user *)from; | |
156 | ||
157 | if (__get_user(*t, f) || | |
158 | __get_user(*(t + 1), f + 1) || | |
159 | __get_user(to->exponent, &from->exponent)) | |
160 | return 1; | |
161 | } | |
162 | return 0; | |
163 | } | |
164 | ||
165 | extern int have_fpx_regs; | |
166 | ||
77bf4400 JD |
167 | static int copy_sc_from_user(struct pt_regs *regs, |
168 | struct sigcontext __user *from) | |
1da177e4 | 169 | { |
a5f6096c | 170 | struct sigcontext sc; |
a5a678c8 | 171 | int err, pid; |
1da177e4 LT |
172 | |
173 | err = copy_from_user(&sc, from, sizeof(sc)); | |
ba180fd4 | 174 | if (err) |
5d86456d | 175 | return err; |
1da177e4 | 176 | |
a5a678c8 | 177 | pid = userspace_pid[current_thread_info()->cpu]; |
377fad3a | 178 | copy_sc(®s->regs, &sc); |
a5f6096c JD |
179 | if (have_fpx_regs) { |
180 | struct user_fxsr_struct fpx; | |
1da177e4 | 181 | |
966c8079 WC |
182 | err = copy_from_user(&fpx, |
183 | &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0], | |
a5f6096c JD |
184 | sizeof(struct user_fxsr_struct)); |
185 | if (err) | |
186 | return 1; | |
187 | ||
188 | err = convert_fxsr_from_user(&fpx, sc.fpstate); | |
189 | if (err) | |
190 | return 1; | |
191 | ||
a5a678c8 | 192 | err = restore_fpx_registers(pid, (unsigned long *) &fpx); |
a5f6096c JD |
193 | if (err < 0) { |
194 | printk(KERN_ERR "copy_sc_from_user - " | |
195 | "restore_fpx_registers failed, errno = %d\n", | |
196 | -err); | |
197 | return 1; | |
198 | } | |
199 | } | |
200 | else { | |
201 | struct user_i387_struct fp; | |
202 | ||
203 | err = copy_from_user(&fp, sc.fpstate, | |
204 | sizeof(struct user_i387_struct)); | |
205 | if (err) | |
206 | return 1; | |
207 | ||
a5a678c8 | 208 | err = restore_fp_registers(pid, (unsigned long *) &fp); |
a5f6096c JD |
209 | if (err < 0) { |
210 | printk(KERN_ERR "copy_sc_from_user - " | |
211 | "restore_fp_registers failed, errno = %d\n", | |
212 | -err); | |
213 | return 1; | |
214 | } | |
1da177e4 LT |
215 | } |
216 | ||
5d86456d | 217 | return 0; |
1da177e4 LT |
218 | } |
219 | ||
77bf4400 JD |
220 | static int copy_sc_to_user(struct sigcontext __user *to, |
221 | struct _fpstate __user *to_fp, struct pt_regs *regs, | |
222 | unsigned long sp) | |
1da177e4 | 223 | { |
ba180fd4 | 224 | struct sigcontext sc; |
c578455a | 225 | struct faultinfo * fi = ¤t->thread.arch.faultinfo; |
a5a678c8 | 226 | int err, pid; |
1da177e4 | 227 | |
18baddda JD |
228 | sc.gs = REGS_GS(regs->regs.gp); |
229 | sc.fs = REGS_FS(regs->regs.gp); | |
230 | sc.es = REGS_ES(regs->regs.gp); | |
231 | sc.ds = REGS_DS(regs->regs.gp); | |
7796931f JD |
232 | sc.di = REGS_EDI(regs->regs.gp); |
233 | sc.si = REGS_ESI(regs->regs.gp); | |
234 | sc.bp = REGS_EBP(regs->regs.gp); | |
235 | sc.sp = sp; | |
236 | sc.bx = REGS_EBX(regs->regs.gp); | |
237 | sc.dx = REGS_EDX(regs->regs.gp); | |
238 | sc.cx = REGS_ECX(regs->regs.gp); | |
239 | sc.ax = REGS_EAX(regs->regs.gp); | |
240 | sc.ip = REGS_IP(regs->regs.gp); | |
18baddda | 241 | sc.cs = REGS_CS(regs->regs.gp); |
7796931f JD |
242 | sc.flags = REGS_EFLAGS(regs->regs.gp); |
243 | sc.sp_at_signal = regs->regs.gp[UESP]; | |
18baddda | 244 | sc.ss = regs->regs.gp[SS]; |
ba180fd4 JD |
245 | sc.cr2 = fi->cr2; |
246 | sc.err = fi->error_code; | |
247 | sc.trapno = fi->trap_no; | |
1da177e4 | 248 | |
4d338e1a | 249 | to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1)); |
1da177e4 LT |
250 | sc.fpstate = to_fp; |
251 | ||
a5a678c8 | 252 | pid = userspace_pid[current_thread_info()->cpu]; |
a5f6096c JD |
253 | if (have_fpx_regs) { |
254 | struct user_fxsr_struct fpx; | |
255 | ||
a5a678c8 | 256 | err = save_fpx_registers(pid, (unsigned long *) &fpx); |
a5f6096c JD |
257 | if (err < 0){ |
258 | printk(KERN_ERR "copy_sc_to_user - save_fpx_registers " | |
259 | "failed, errno = %d\n", err); | |
260 | return 1; | |
261 | } | |
262 | ||
263 | err = convert_fxsr_to_user(to_fp, &fpx); | |
264 | if (err) | |
265 | return 1; | |
266 | ||
267 | err |= __put_user(fpx.swd, &to_fp->status); | |
268 | err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic); | |
269 | if (err) | |
270 | return 1; | |
271 | ||
272 | if (copy_to_user(&to_fp->_fxsr_env[0], &fpx, | |
273 | sizeof(struct user_fxsr_struct))) | |
274 | return 1; | |
275 | } | |
276 | else { | |
277 | struct user_i387_struct fp; | |
278 | ||
a5a678c8 | 279 | err = save_fp_registers(pid, (unsigned long *) &fp); |
a5f6096c JD |
280 | if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct))) |
281 | return 1; | |
282 | } | |
1da177e4 | 283 | |
a5f6096c | 284 | return copy_to_user(to, &sc, sizeof(sc)); |
1da177e4 | 285 | } |
1da177e4 | 286 | |
ba180fd4 JD |
287 | static int copy_ucontext_to_user(struct ucontext __user *uc, |
288 | struct _fpstate __user *fp, sigset_t *set, | |
289 | unsigned long sp) | |
1da177e4 LT |
290 | { |
291 | int err = 0; | |
292 | ||
293 | err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp); | |
294 | err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags); | |
295 | err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size); | |
98c18238 | 296 | err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, sp); |
1da177e4 | 297 | err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set)); |
5d86456d | 298 | return err; |
1da177e4 LT |
299 | } |
300 | ||
301 | struct sigframe | |
302 | { | |
4d338e1a | 303 | char __user *pretcode; |
1da177e4 LT |
304 | int sig; |
305 | struct sigcontext sc; | |
306 | struct _fpstate fpstate; | |
307 | unsigned long extramask[_NSIG_WORDS-1]; | |
308 | char retcode[8]; | |
309 | }; | |
310 | ||
311 | struct rt_sigframe | |
312 | { | |
4d338e1a | 313 | char __user *pretcode; |
1da177e4 | 314 | int sig; |
4d338e1a AV |
315 | struct siginfo __user *pinfo; |
316 | void __user *puc; | |
1da177e4 LT |
317 | struct siginfo info; |
318 | struct ucontext uc; | |
319 | struct _fpstate fpstate; | |
320 | char retcode[8]; | |
321 | }; | |
322 | ||
323 | int setup_signal_stack_sc(unsigned long stack_top, int sig, | |
324 | struct k_sigaction *ka, struct pt_regs *regs, | |
325 | sigset_t *mask) | |
326 | { | |
327 | struct sigframe __user *frame; | |
4d338e1a | 328 | void __user *restorer; |
98c18238 | 329 | unsigned long save_sp = PT_REGS_SP(regs); |
1da177e4 LT |
330 | int err = 0; |
331 | ||
3896625d JD |
332 | /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ |
333 | stack_top = ((stack_top + 4) & -16UL) - 4; | |
4d338e1a | 334 | frame = (struct sigframe __user *) stack_top - 1; |
1da177e4 LT |
335 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
336 | return 1; | |
337 | ||
4d338e1a | 338 | restorer = frame->retcode; |
ba180fd4 | 339 | if (ka->sa.sa_flags & SA_RESTORER) |
1da177e4 LT |
340 | restorer = ka->sa.sa_restorer; |
341 | ||
98c18238 JD |
342 | /* Update SP now because the page fault handler refuses to extend |
343 | * the stack if the faulting address is too far below the current | |
344 | * SP, which frame now certainly is. If there's an error, the original | |
345 | * value is restored on the way out. | |
346 | * When writing the sigcontext to the stack, we have to write the | |
347 | * original value, so that's passed to copy_sc_to_user, which does | |
348 | * the right thing with it. | |
349 | */ | |
350 | PT_REGS_SP(regs) = (unsigned long) frame; | |
351 | ||
1da177e4 LT |
352 | err |= __put_user(restorer, &frame->pretcode); |
353 | err |= __put_user(sig, &frame->sig); | |
98c18238 | 354 | err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp); |
1da177e4 LT |
355 | err |= __put_user(mask->sig[0], &frame->sc.oldmask); |
356 | if (_NSIG_WORDS > 1) | |
357 | err |= __copy_to_user(&frame->extramask, &mask->sig[1], | |
358 | sizeof(frame->extramask)); | |
359 | ||
360 | /* | |
361 | * This is popl %eax ; movl $,%eax ; int $0x80 | |
362 | * | |
363 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
364 | * reasons and because gdb uses it as a signature to notice | |
365 | * signal handler stack frames. | |
366 | */ | |
367 | err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); | |
368 | err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2)); | |
369 | err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); | |
370 | ||
ba180fd4 | 371 | if (err) |
98c18238 | 372 | goto err; |
1da177e4 LT |
373 | |
374 | PT_REGS_SP(regs) = (unsigned long) frame; | |
375 | PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; | |
376 | PT_REGS_EAX(regs) = (unsigned long) sig; | |
377 | PT_REGS_EDX(regs) = (unsigned long) 0; | |
378 | PT_REGS_ECX(regs) = (unsigned long) 0; | |
379 | ||
380 | if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) | |
381 | ptrace_notify(SIGTRAP); | |
98c18238 JD |
382 | return 0; |
383 | ||
384 | err: | |
385 | PT_REGS_SP(regs) = save_sp; | |
386 | return err; | |
1da177e4 LT |
387 | } |
388 | ||
389 | int setup_signal_stack_si(unsigned long stack_top, int sig, | |
390 | struct k_sigaction *ka, struct pt_regs *regs, | |
391 | siginfo_t *info, sigset_t *mask) | |
392 | { | |
393 | struct rt_sigframe __user *frame; | |
4d338e1a | 394 | void __user *restorer; |
98c18238 | 395 | unsigned long save_sp = PT_REGS_SP(regs); |
1da177e4 LT |
396 | int err = 0; |
397 | ||
398 | stack_top &= -8UL; | |
4d338e1a | 399 | frame = (struct rt_sigframe __user *) stack_top - 1; |
1da177e4 LT |
400 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
401 | return 1; | |
402 | ||
4d338e1a | 403 | restorer = frame->retcode; |
ba180fd4 | 404 | if (ka->sa.sa_flags & SA_RESTORER) |
1da177e4 LT |
405 | restorer = ka->sa.sa_restorer; |
406 | ||
98c18238 JD |
407 | /* See comment above about why this is here */ |
408 | PT_REGS_SP(regs) = (unsigned long) frame; | |
409 | ||
1da177e4 LT |
410 | err |= __put_user(restorer, &frame->pretcode); |
411 | err |= __put_user(sig, &frame->sig); | |
412 | err |= __put_user(&frame->info, &frame->pinfo); | |
413 | err |= __put_user(&frame->uc, &frame->puc); | |
414 | err |= copy_siginfo_to_user(&frame->info, info); | |
415 | err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask, | |
98c18238 | 416 | save_sp); |
1da177e4 LT |
417 | |
418 | /* | |
419 | * This is movl $,%eax ; int $0x80 | |
420 | * | |
421 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
422 | * reasons and because gdb uses it as a signature to notice | |
423 | * signal handler stack frames. | |
424 | */ | |
425 | err |= __put_user(0xb8, (char __user *)(frame->retcode+0)); | |
426 | err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1)); | |
427 | err |= __put_user(0x80cd, (short __user *)(frame->retcode+5)); | |
428 | ||
ba180fd4 | 429 | if (err) |
98c18238 | 430 | goto err; |
1da177e4 | 431 | |
1da177e4 LT |
432 | PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; |
433 | PT_REGS_EAX(regs) = (unsigned long) sig; | |
434 | PT_REGS_EDX(regs) = (unsigned long) &frame->info; | |
435 | PT_REGS_ECX(regs) = (unsigned long) &frame->uc; | |
436 | ||
437 | if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) | |
438 | ptrace_notify(SIGTRAP); | |
98c18238 JD |
439 | return 0; |
440 | ||
441 | err: | |
442 | PT_REGS_SP(regs) = save_sp; | |
443 | return err; | |
1da177e4 LT |
444 | } |
445 | ||
446 | long sys_sigreturn(struct pt_regs regs) | |
447 | { | |
448 | unsigned long sp = PT_REGS_SP(¤t->thread.regs); | |
4d338e1a | 449 | struct sigframe __user *frame = (struct sigframe __user *)(sp - 8); |
1da177e4 LT |
450 | sigset_t set; |
451 | struct sigcontext __user *sc = &frame->sc; | |
452 | unsigned long __user *oldmask = &sc->oldmask; | |
453 | unsigned long __user *extramask = frame->extramask; | |
454 | int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long); | |
455 | ||
ba180fd4 JD |
456 | if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) || |
457 | copy_from_user(&set.sig[1], extramask, sig_size)) | |
1da177e4 LT |
458 | goto segfault; |
459 | ||
460 | sigdelsetmask(&set, ~_BLOCKABLE); | |
461 | ||
462 | spin_lock_irq(¤t->sighand->siglock); | |
463 | current->blocked = set; | |
464 | recalc_sigpending(); | |
465 | spin_unlock_irq(¤t->sighand->siglock); | |
466 | ||
ba180fd4 | 467 | if (copy_sc_from_user(¤t->thread.regs, sc)) |
1da177e4 LT |
468 | goto segfault; |
469 | ||
470 | /* Avoid ERESTART handling */ | |
471 | PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; | |
5d86456d | 472 | return PT_REGS_SYSCALL_RET(¤t->thread.regs); |
1da177e4 LT |
473 | |
474 | segfault: | |
475 | force_sig(SIGSEGV, current); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | long sys_rt_sigreturn(struct pt_regs regs) | |
480 | { | |
4d338e1a | 481 | unsigned long sp = PT_REGS_SP(¤t->thread.regs); |
ba180fd4 JD |
482 | struct rt_sigframe __user *frame = |
483 | (struct rt_sigframe __user *) (sp - 4); | |
1da177e4 LT |
484 | sigset_t set; |
485 | struct ucontext __user *uc = &frame->uc; | |
486 | int sig_size = _NSIG_WORDS * sizeof(unsigned long); | |
487 | ||
ba180fd4 | 488 | if (copy_from_user(&set, &uc->uc_sigmask, sig_size)) |
1da177e4 LT |
489 | goto segfault; |
490 | ||
491 | sigdelsetmask(&set, ~_BLOCKABLE); | |
492 | ||
493 | spin_lock_irq(¤t->sighand->siglock); | |
494 | current->blocked = set; | |
495 | recalc_sigpending(); | |
496 | spin_unlock_irq(¤t->sighand->siglock); | |
497 | ||
ba180fd4 | 498 | if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext)) |
1da177e4 LT |
499 | goto segfault; |
500 | ||
501 | /* Avoid ERESTART handling */ | |
502 | PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; | |
5d86456d | 503 | return PT_REGS_SYSCALL_RET(¤t->thread.regs); |
1da177e4 LT |
504 | |
505 | segfault: | |
506 | force_sig(SIGSEGV, current); | |
507 | return 0; | |
508 | } |